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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b8f9e9da6d8b7cdb58529f399979c8ce1d789ae7a2ea1cfa27e8d44f40bd32a' 
  AND token = '3AWxhGhDYFFXi0FvMeYO/SNaydY40dmwoNuD7VQiCI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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