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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9713f5ac3a69d9152d2fca450b776154cb00d7fa278857cc2d6de38208302a48' 
  AND token = '3ACThfGzPYQGIuz82WA/FT0h6JlGWHTMmkn7teU0Hs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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