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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5bd0f8a0aa5c894586a574d5f5fc45c0530f93f682ead931e103a3d9e7d8d17' 
  AND token = 'sViq26T2ls5bVPlolhedTIpupxhfJEN56zURoNOBxmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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