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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '275c78294218b59106e3efa6b01ee53f5f8b35fe004391ce6b44e5db777385ff' 
  AND token = 'Qmw8QuMDbY+UMu96Qw6xUU1oXS3kBaO2jYZaYySbL40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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