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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '986c5bbc23cb51c0e9ef20bc5a6ab30a46d3751604b5d9d4c1dc73d140bbb533' 
  AND token = 'hWR+ctjjEbd96pTEY8hw5xmYPJbFUdjEKMT5XoHBZeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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