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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2313d5f0a321cea0b0a2078ab2fcfb52bc63bebf76d66c7e322b73ff444ac7ff' 
  AND token = 'ZdvsmPWrsoAnq2CmdNc4v1Y+sqBHP09Tz71uPXR3wHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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