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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ed1b4e4d13d34b10f8a3fc62cb2b01c8448d60ca4eac571a7a08f05d5623c17' 
  AND token = 'REv+cc69nt+4glHhsf3T3g6O8WTor7nkKursR1kdUUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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