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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42474e76883e59658a74951dc3b6dcb12396ca37d15ba13d6536516cdf5d30f7' 
  AND token = 'egnBJLdVITnrL6HpzL50QIdadQNmTMK6SzK/FNW2hdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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