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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '501414609ad27ee4d95d474ea98f867f9ae15e8b057b15f2b7b64bb433bf723d' 
  AND token = 'Lvm2QPJCGxsiMx3LOm1Y19WdXdQeCnKYqDfqa/jtFW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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