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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6694ff9058d3e85bd79a7aa92538328b65ac2e14ad44b0790d9a8ba2b2f064dd' 
  AND token = 'gj0EpLzoIFS/sPi3AgIH7p2PfsbCT4gyDBl1UgBSFBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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