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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '796593695a3745a53f72dae4fdbe66eafe2194276aa1735939187705d3e987c2' 
  AND token = '6vmWY1TEfqFTqLx63zde4E2bMN87Aj4yGbolGI8q2FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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