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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6be97b6c9e5d373e6c3fb73102a075e72e3b10bf31086517e7d7eedd5b380762' 
  AND token = 'bJc4KZryRGDmGEJ2mRL4kobvLSUybCwqn4DCEGCUZSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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