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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f037787cb4e46e74c5814ce6267e9dc9ddf0256d1e083e0bb5f2e63b71ee7c0e' 
  AND token = '2SCyLwaDiLoDPfLHoYOv6xSx1CoxmlpKEM1SjJE9WTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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