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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8fb1a55fa0e17ac577079be83501beb4ae0350e43b2be8f29186c4939da4b95' 
  AND token = '9SYGGK82AtkE5Dv5YmwTPg940DefkieaZNDBu+rg6M0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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