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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '193ad8fd7287c53c3229c9561d9cdca847d7e1bdcf9850862b7505c51161ff85' 
  AND token = 'lRoTg6mzo4JD7sJzCN7DamBScQ23XhFfBxAp9ZgJMRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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