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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c5bbb2a231ca76f8788e81ae2a09c19e49ee85ac6191cd6fef76ab52bca5d8' 
  AND token = 'NwE37mLyj+vCQSPSDazKMqdsd/D1KWfEg9DT7doAMu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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