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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '158ee626fab824e7b1f9140385d32f3d40ba3016eb712ee6d80fa38507550a51' 
  AND token = 'G9xdSjcouNJuatrfn3xUz+lDm++rM0gzEp1hVJN3vDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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