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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d70d55d3a673f6a9a2e8b1bea8138577ed3dde6ca807087e971a1d4e9261ca' 
  AND token = '86tu+eatSrrVYs3b9rBz1kwaz24ULfUqIc5xJkqnR2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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