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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5efe12d6c373577cb7f4b6ab78a1a8bd5c76310585653431ec2b5aeaabbcd458' 
  AND token = 'RUxKcYKVThmgHczQbS9Nf42N1b13l41F4PITwymLpfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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