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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f1f89d3245b12e84c8f756f79c35d42d984ddc3e419e900e1b9008c24a77b5f' 
  AND token = 'pVe1kEvajnd5XV0HUvtPwW1nSHobIxQXvBuAv7ox35o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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