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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc64f82719197208644f4242520e41fd771647f6ac68e05c701accb6cfd47fb5' 
  AND token = '0nF2f5ZyvU26Ery1p5I7wiHS8TG0pNXLBzq2R8PMg7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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