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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e06eccc86ed026129bd54674e0f340be5294a05436f925938e94bca4575f5b7' 
  AND token = 'F6SmDol0Scw+F2pvspu3NDOFf9RYV98T6+1b+m4ZhyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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