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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e628db9fb8a955c27fd083c27474b33fba1014d51a9b6212e48a85c3da4abd2' 
  AND token = 'e4M3jk+Bj4U2vdnEFaiIaTXJLplY8qLHq8F1UXY+M/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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