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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e3344277e755fde7a1f9235d4e124e372056ff4af456973ce30778819b30cd3' 
  AND token = 'peMjKycNx7Kn1IQOSQSAXaZ3+9rFGR8c6Jz3yzZsU3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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