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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f616fc1db3f4983ad01c79a282c5e12699de0c6c5f58300d8ff4107b603ba6e3' 
  AND token = '97DzSA/niJbv2lLwI1pQri0ri4dG4DlgLpdpdClOhTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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