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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ff940ab246947d725c7501a3cb0e0a6bb50868c2c00e7dcc404dc4fbb8996e7' 
  AND token = 'HSsMM5Urxlims2MQX8jFz9dx5Rl04vKRB/mYQFAZAhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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