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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a90e4528fce9d7271adb1333bab7c378d5987e66a3e47c88488894570742dda0' 
  AND token = 'h6/NQn4pt5LdWEZgIh1kcJHC9gljOqTQor+kI/X8aM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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