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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dca013e2f2308a112b37c53041e316695264a51fd1b83d3d8d1e8df94fc9f45' 
  AND token = 'RmPA8lRW3vmuddu1eLq7JMm8fjG89GP9UgoXwEl+yWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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