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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5178558090883d9216e23da02c3b15cd95ec077a76dbc5c11f16e6f6e1d23ba8' 
  AND token = '2bHYTyyv4tzIZCbnUCF+PND4cPi4DZXESdJZtKznZVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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