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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a702562394bc3e753cee876b1d3f9df553a8293cf44eeb81e39cf58f4b11d7ce' 
  AND token = 'wZC+mc96rcGRby3CSNt3Ik57Tro0glxOxNN78If3wcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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