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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0380acdfa74510fb3ddead992e62502a9770321a991f7b67f274a756858576e' 
  AND token = 'Ttym1Dh4uJz65/aVXk1ux9Ih/EMkJu1tfCBGWRv6K5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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