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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf90c12c2bf4edc741a5eac820457dea6ffb58d6756781771de38c14aafd3f22' 
  AND token = 'Rk5lzL3SZlE8/WRtX6pg11bKKqJ9/Rj5ggsbbGRzkP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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