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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c3ac3ffe5d3698753624c07deee8bbfcb13a8c06305364503b03d6be052329b' 
  AND token = 'Gl+DMIvjekJjD/payiYsEW1lVQTVIZhHF3rh7Z9kRjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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