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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f748f3b8a3a4602dc1d916d7d2d038f26d7ed28ae646b7dd0b11e7f7f9ac79' 
  AND token = 'mBhLOXHJ4FcaBBa8uRm0h/O5hg0LPxFVOczzzKmJxf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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