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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a5ada4b18577807669acf989a8ff1aa7617038453dd6ade8485a38f1c23b0bf' 
  AND token = 'CLpzCrXBV68rCDc5EA7gs3k0SoW0irW4t5tLFJ2gUkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}