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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a58cbce524b371112c64b27797fa7cda56eac5898dc6d5a7b230045db9c4ac4' 
  AND token = 'Gy3VmwR+SB63nmDBlM+n1Me30kLsngouyT1aSCjaYDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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