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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7df807d5b00fc4ae0cc5ce50ff5c2c61b800b2c1e3ab82f629d0686a28b223ff' 
  AND token = 'XLgGOpH0vpYX1VzcBYbPRDlCp6zvKMQuIPFG92eOB1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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