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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e146088cae40c42da7ffc0e08794bbefbd4d09d3cafb1319588f651e062edd' 
  AND token = '0v6AUGGfNI2wiZobBwp285vLiCi/1B++e17pdx6E8Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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