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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8d13f3a3064c4a11cff079b59394d1e59163a54b7a08dc93c3fd65423921b93' 
  AND token = 'MMTwCueSIjzpi7PVrBduqWeLIBp90dXEblHYQRXFHsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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