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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd93a46de9fbcdd70ff42200d1eb8ac80787c06211c797b2a025c6a84abb0f31a' 
  AND token = 'z09XINM/VE4D6syHB2h1oYefePrp3t0x5loLCF1mlGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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