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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df9bb8aec027ca51e182d27381a9c138b91124f40ba16eefd56c5d40ae632825' 
  AND token = 'ZMH/Ew71tcxtIemKEz4mu96iQZ1l973sU8VabdVRn58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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