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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd225bb29e9d2f212fdd9811df9c7007bf3dc4c4460224feac7eeb40a85c4639' 
  AND token = '5h9pj+En98csyAVwPR8eJBURECwTT7gHaWR9OHYEUkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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