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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6116de594762a4e460285db7de8879ea84284aed449037f4b5ef6e7c8c4606a' 
  AND token = 'hHJc7cqDnYPima4U2NWQm1MB9463wbjJp9kNCsN0YBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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