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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '174fb51ae826ed7c3c809b8f4d3a80c1b62a6336e2794ccf2fd35af55c6e7cb4' 
  AND token = 'Uxhbvexa19wv81LqObVS5INST3jKtRPUw2owR1/kR6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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