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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2665149eb0728490443d805f6996e1dd29c67526a74e916af97a7e5a130fa707' 
  AND token = 'zpEq66j9arIRG31wU5LBEyXmovwSGrNvorAU9x9UmvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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