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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c88bec3d5d261133789b08ffc58dd19ff705d6104129c49c8fca35012c8c4652' 
  AND token = 'xXrhQq6B27dtLateQ18u3G00Y+vkIM1/T7RKjTZERFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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