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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9743b39129c7fc961e8389758cb626eba907055c424c4a5e35d22ef3f683449' 
  AND token = '6Ly3Xi1IZ0Ao3GXGgu7WAy4/yCLXaSa3gH/yJ/HZIhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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