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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b702441496a21b48a99a4b02ef89b1a9524750088194ad53cf242b6ce585c0' 
  AND token = '/6R1Okja8HHeyIYWVl76+sZbZ1wCOn43Ny/DkTcqUMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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