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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8711706a4df9925c722ef1989803773197d241c9761884c7fd1f1f2a3abcc1c6' 
  AND token = '/nbUZKMO57t0s8z/gvX8OPXOwf/ONM36FAKlHkYU7HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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