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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa6132ac7950fda59923461ae30a82f328650dd26c1e7ea97ad16359ec9a1779' 
  AND token = '4o7s+sgfZBIO5X4uNgPdv1WnSsaEdFhg5cBFksFhsbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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