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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27636908d62cb7d13a343b9813870e562a9062bd2f1cdd158ab09d160486ad1e' 
  AND token = 'fM/V2G1WTmmpTVW8C6F704kDEZjLiCy9Ud9CnG/NYKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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