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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f364ed39bc90ecbd1cf4dc7d690b55b3307904ff60e4cfa6053e7569c3c31a' 
  AND token = 'HNY7te6M3R9c2sjZ+tx0/tIXhM+LavAbPXb+T6dSe98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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