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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcdab51894ba1a8043cb9470cbdb2a595d07c7e10bb055e7c2fedc9cb27daa76' 
  AND token = 'TaOUYdGMTaCeeMROMooDWosr52sMwae9ykq47Jvdzfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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