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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3517a7a0c57d37464bb5bf624140643656dbc2613369dd8f10c0e8441434cf02' 
  AND token = 'LwqSxxQExKkIlRMxmP7oqqIBYMKjckWpZ4iCa4VBckY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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