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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3e175f8a77451361eb7fecdcbdb434e9321f6a57a3e6124c1a66a25c45895b9' 
  AND token = 'tr5qFvYrwTxGYxoG51F3qfP+e15BesEwNvSQEPFx5UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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