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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a82d6b90a2a65820d551b438bffc2a9888ee7d1c5973771e992f3f2a496be2d' 
  AND token = 'bcZtX6GqFRob9Wbii/2Nx/D641NPRFodE7uv0MbzlWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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