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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1dd398de97cf008a3a83bf4e516de0f112c43fcd5b5fa94bb50b7dbb9dbd457' 
  AND token = 'r0Nwb/hDv6lWlKm45XF7lG5pySf1UUgOOmjz0R/0/1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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