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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ca406f2dc96139a80031cac5527e4ce07938537a9dd0627af69007bc43b05c3' 
  AND token = 'StL4eQvyXpUHMDM3jUe0FABSVWj4gVR2asfRBMln25w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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