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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '083c34bc82bd7f62b9dfc0c09c666465ff154c2ac176b37b321438b27b29cc10' 
  AND token = '3q3kLEUKLdWxloVhTja10Mm2ILpN1dTUFoudm7pIWbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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