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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c32caf085c79de203af16fb4e87d0a9e39ff391881b9b22e5859681da0f49763' 
  AND token = 'MS1o8obNE+NfRoYBCxS7F+wp8t5Da/aXwGoxOBpmK90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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